研究目的
Investigating the manufacturability by laser-based powder bed fusion (L-PBF) of aluminum-based lattice materials by varying the beam diameter and thus the relative density.
研究成果
A357.0 BCCXYZ lattice materials were proven feasible by L-PBF down to relative density values of 20% and to a strut diameter-to-cell length ratio as low as 0.17. An upper lightweighting limit of 80% could be reached successfully for a cell dimension of 3 mm.
研究不足
The design of a lattice structure can be accomplished either by tessellation of a manually generated unit cell or by implementation of a mathematically generated periodical pattern. The BCCXYZ cell is especially problematic due to the orientation of the struts and bridging parts. The intensive memory occupation of .STL files is an additional technological hurdle to manage.
1：Experimental Design and Method Selection:
The study focused on the manufacturability of A
2：0 lattice materials by L-PBF, varying the beam diameter and relative density. Sample Selection and Data Sources:
3 Cubic samples with an edge length approaching 48 mm were designed and printed, with the size of the single BCCXYZ unit cell kept constant at 3 mm.
3：List of Experimental Equipment and Materials:
An SLM? 500 machine was used, operated with a scan speed of 1100 mm/s, laser power of 350 W, and layer thickness of
4：050 mm. The chemical composition of the feedstock powder was detailed. Experimental Procedures and Operational Workflow:
The geometry was oriented in such a way that the struts labeled Sz were parallel to the growth (Z) direction. After printing, all the specimens were T6 treated under an inert atmosphere.
5：Data Analysis Methods:
The mass of the lattice sample was measured with an electronic balance, and the volume was calculated as the volume of a rectangular prism. The experimental density was determined as the mass-to-volume ratio.
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